The EGW Ruger revolver scope bases are designed to fit factory-drilled and tapped revolvers, providing the adaptability of a one-piece picatinny scope rail without the need for additional drilling or tapping. These bases are precision-machined from extruded 6061-T6 aluminum, featuring picatinny slot-and-rail spacing that facilitates quick and easy adjustments to eye relief and offers extensive flexibility in scope selection. They are pre-drilled to align with the factory scope mount holes on the firearm's receiver and are compatible with both picatinny and weaver scope rings. The lightweight tactical mounts incorporate a milled center channel to reduce weight, while the full-width cross-slots are manufactured to MIL-STD-1913 specifications with a tolerance of +/- 0.002 inches. The package includes socket head Torx screws and a wrench. EGW advises applying 20 in-lb of torque and a drop of blue Loctite for secure mounting. The rail attaches via the rear sight hole and necessitates drilling and tapping two extra holes in the receiver if it is not pre-drilled and tapped The mount is offered in an undrilled version, allowing for customization to fit non-standard bolt patterns, ensuring compatibility with unique configurations